搜索结果: 16-30 共查到“海洋科学 nitrate”相关记录45条 . 查询时间(0.207 秒)
Direct and indirect coupling of primary production and diel nitrate dynamics in a subtropical spring-fed river
primary production iel nitrate dynamics
2014/4/16
We used high-frequency in situ measurements of nitrate (NO{
3
) and dissolved oxygen (DO) from the springfed Ichetucknee River, Florida, to derive multiple independent estimates of assimilatory nitr...
Seasonal variations in the concentrations of methyl and ethyl nitrate in ashallow freshwater lake
Seasonal variations in the concentrations methyl ethyl nitrate in a shallow freshwater lake
2014/4/16
Between February and October 2007, a time series of alkyl nitrate concentrations in the water column of a shallow freshwater lake, University of East Anglia Broad, located in southeastern England was ...
Hydrologic and biotic influences on nitrate removal in a subtropical spring-fed river
Hydrologic biotic influences on nitrate removal a subtropical spring-fed river
2014/4/16
We use a long-term chemical and hydrologic record in combination with longitudinal sampling and highfrequency nitrate (NO{3) measurements from in situ sensors to describe temporal and spatial patterns...
Mapping the spatial variability of plankton metabolism using nitrate and oxygen sensors on an autonomous underwater vehicle
Mapping the spatial metabolism using nitrate
2014/4/18
It is now possible to make highly resolved vertical (,1 m) and horizontal (3 m at constant depth and ,400 m
when undulating from surface to 100 m) measurements of nitrate concentration in the upper o...
Nitrogen isotopic fractionation associated with growth on dinitrogen gas and nitrate by cyanobacteria
Nitrogen isotopic fractionation associated cyanobacteria
2014/4/18
This study investigated the bulk nitrogen isotopic composition and fractionation of marine and freshwater
cyanobacteria growing at the expense of atmospheric dinitrogen gas (N2) or nitrate (NO{
3
)...
Iodine assimilation by marine diatoms and other phytoplankton in nitrate-replete conditions
marine diatoms Iodine assimilation
2014/4/17
Several marine phytoplankton species, primarily diatoms, were examined for the accumulation of iodide (10
species) and iodate (9 species) using radioactive iodine-125 in f/2 artificial seawater, a ni...
Nitrogen and oxygen isotope fractionation during dissimilatory nitrate reduction by denitrifying bacteria
Nitrogen and oxygen isotope fractionation dissimilatory nitrate reduction denitrifying bacteria
2014/4/21
We report the first measurements of coupled nitrogen (N) and oxygen (O) isotope fractionation of nitrate by laboratory cultures of denitrifying bacteria. Two seawater strains (Pseudomonas stutzeri, Oc...
Mapping the spatial variability of plankton metabolism using nitrate and oxygen sensors on an autonomous underwater vehicle
Mapping the spatial variability plankton metabolism using nitrate oxygen sensors autonomous underwater vehicle
2014/5/16
It is now possible to make highly resolved vertical (<1 m) and horizontal (3 m at constant depth and ~400 m when undulating from surface to 100 m) measurements of nitrate concentration in the upper oc...
Seasonal dynamics of new production from Trichodesmium N2 fixation and nitrate uptake in the upstream Kuroshio and South China Sea basin
Seasonal dynamics Trichodesmium N2 fixation
2014/4/21
The seasonal dynamics of primary production in the upstream Kuroshio was studied to understand why
pelagic fish are relatively populous in this oligotrophic tropical ocean region. The relative import...
Effects of nitrate and phosphate on grazer-induced toxin production in Alexandrium minutum
nitrate phosphate grazer-induced toxin production Alexandrium minutum
2014/4/21
Two strains ofAlexandrium minutumwere exposed to waterborne cues from copepod grazers in factorial combinations of nitrate and phosphate concentrations to evaluate the importance of grazer-induced par...
Physical pathways and utilization of nitrate supply to the giant kelp, Macrocystis pyrifera
Physical pathways utilization of nitrate supply giant kelp, Macrocystis pyrifera
2014/4/18
To determine the relative importance of different sources of nitrate to the annual nitrogen needs of the giant kelpMacrocystis pyrifera,we measured ambient nitrate concentrations at a kelp forest for ...
A nitrate sink in estuaries? An assessment by means of stable nitrate isotopes in the Elbe estuary
nitrate sink in estuaries stable nitrate isotopes Elbe estuary
2014/4/18
To elucidate the fate of river-borne nitrate in the estuarine environment, we measured nitrate concentrations and d15N andd18O of nitrate along the salinity gradient in the estuary of the river Elbe, ...
Nitrogen and oxygen isotopic signatures of subsurface nitrate seaward of the Florida Keys reef tract
Nitrogen oxygen isotopic signatures subsurface nitrate seaward Florida Keys reef tract
2014/4/22
Hydrographic and nutrient structure and the nitrogen and oxygen isotopic compositions (d15N and d18O) of the nitrate pool seaward of the Florida Keys reef tract were measured in Summer 2003. Nitrate a...
Nitrate-depleted conditions on the increase in shallow northern European lakes
Nitrate-depleted northern European lakes
2014/4/22
We determined relative nitrate-nitrogen (NO3-N) loss rates in 100 north-mid-European lakes from late spring to summer by using the exponential function N2 = N1e-k(t2 - t2), where N1 and N2 are NO3-N c...
HANDS-ON OCEANOGRAPHY——Investigating Coastal Processes and Nitrate Levels in the Elkhorn Slough Using Real-Time Data
Coastal salinity temperature nitrate swamp
2015/7/22
The primary objective of this activity is to predict how coastal processes, such as tides, affect salinity, temperature, and nitrate levels in a type of estuary, called a slough. Real-time data from t...